大氧吧

source of oxygen (of forests and nature reserves) / (cliché) lungs of the planet

bar (loanword) (serving drinks, or providing Internet access etc) / to puff (on a pipe etc) / (onom.) bang / abbr. for 貼吧|贴吧[tie1 ba1]

(modal particle indicating suggestion or surmise) / ...right? / ...OK? / ...I presume.

(onom.) smack!

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

oxygen (chemistry)